# TargetBlockNumberInPast (/docs/errors/chain/TargetBlockNumberInPast)

The scheduler was given a dispatch block that is not in the future. Compare the `when` argument against the current block number and choose a strictly later block.

Declared by the `Scheduler` pallet; it classifies to the semantic code [`invalid_argument`](/docs/errors/invalid-argument).

## Remediation [#remediation]

Check the argument values against the operation schema

The same explanation is available in the terminal: `btcli explain TargetBlockNumberInPast`.